package br.com.hsp.system.filters;

import java.io.IOException;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;

@WebFilter(servletNames={"Faces Servlet"})
public class JPAFilter implements Filter {
	private EntityManagerFactory factory;

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		this.factory = Persistence.createEntityManagerFactory("HSPteste_db");
	}

	@Override
	public void destroy() {
		this.factory.close();
	}

	@Override
	public void doFilter( ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
	//CHEGADA
	EntityManager manager = this.factory.createEntityManager();
	request.setAttribute("EntityManager", manager);
	manager.getTransaction().begin();
	//FACES SERVLET
		chain.doFilter(request,	response);
		
	//SAIDA
		try {
			manager.getTransaction().commit();
		}	catch(Exception e) {
			manager.getTransaction().rollback();
		}finally {
			manager.close();
		}
	}
}
